You can access the Automated Stop-Loss configuration by clicking in the "Protection" tab in your vault's page.

Figure 1: Vault Protection Overview

In that page you can modify the Stop-Loss Collateralization Ratio, the asset received, or you can disable all protections completely by clicking on the "Cancel downside protection" button.

Any modifications to the state of the Automated Stop-Loss or its parameters will require you to send a transaction, and will incur in gas costs.